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WO2007066299A3 - Method to quasi-synchronise transmissions in ad-hoc wireless lans - Google Patents

Method to quasi-synchronise transmissions in ad-hoc wireless lans Download PDF

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Publication number
WO2007066299A3
WO2007066299A3 PCT/IB2006/054639 IB2006054639W WO2007066299A3 WO 2007066299 A3 WO2007066299 A3 WO 2007066299A3 IB 2006054639 W IB2006054639 W IB 2006054639W WO 2007066299 A3 WO2007066299 A3 WO 2007066299A3
Authority
WO
WIPO (PCT)
Prior art keywords
quasi
transmissions
synchronise
duration
hoc wireless
Prior art date
Application number
PCT/IB2006/054639
Other languages
French (fr)
Other versions
WO2007066299A2 (en
Inventor
Hans-J Reumerman
Gergios Orfanos
Willi Butsch
Original Assignee
Koninkl Philips Electronics Nv
Philips Corp
Hans-J Reumerman
Gergios Orfanos
Willi Butsch
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninkl Philips Electronics Nv, Philips Corp, Hans-J Reumerman, Gergios Orfanos, Willi Butsch filed Critical Koninkl Philips Electronics Nv
Publication of WO2007066299A2 publication Critical patent/WO2007066299A2/en
Publication of WO2007066299A3 publication Critical patent/WO2007066299A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0866—Non-scheduled access, e.g. ALOHA using a dedicated channel for access
    • H04W74/0891—Non-scheduled access, e.g. ALOHA using a dedicated channel for access for synchronized access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/26035—Maintenance of orthogonality, e.g. for signals exchanged between cells or users, or by using covering codes or sequences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2627—Modulators
    • H04L27/2634—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2646—Arrangements specific to the transmitter only using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/02—Channels characterised by the type of signal
    • H04L5/023—Multiplexing of multicarrier modulation signals, e.g. multi-user orthogonal frequency division multiple access [OFDMA]
    • H04L5/026—Multiplexing of multicarrier modulation signals, e.g. multi-user orthogonal frequency division multiple access [OFDMA] using code division
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Discrete Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

In a MC-CDMA system asynchrony is minimized in order to increase the performance of the Multi-User Detector (MUD) at the receiver of a mobile station. Asynchrony is minimized by quasi-synchronizing the stations (mobile or otherwise) in the ad-hoc network to initiate transmissions only at regular intervals in time. The intervals have a duration that is equal to a multiple of the duration of a multi-carrier symbol. At present, the IEEE 802.11 standard sets a multi-carrier symbol duration to be 4 μsec.
PCT/IB2006/054639 2005-12-08 2006-12-06 Method to quasi-synchronise transmissions in ad-hoc wireless lans WO2007066299A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US74873405P 2005-12-08 2005-12-08
US60/748,734 2005-12-08

Publications (2)

Publication Number Publication Date
WO2007066299A2 WO2007066299A2 (en) 2007-06-14
WO2007066299A3 true WO2007066299A3 (en) 2007-10-11

Family

ID=38024399

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2006/054639 WO2007066299A2 (en) 2005-12-08 2006-12-06 Method to quasi-synchronise transmissions in ad-hoc wireless lans

Country Status (1)

Country Link
WO (1) WO2007066299A2 (en)

Non-Patent Citations (6)

* Cited by examiner, † Cited by third party
Title
"IEEE standard Part 11: wireless LAN medium access control (MAC) and physical layer (PHY) specification. (ISO/IEC 8802-11, ANSI/IEEE Std 802.11-1999) Chapter 9: MAC sublayer functional description", ISO/IEC 8802-11 ANSI/IEEE STD 802.11, 20 August 1999 (1999-08-20), pages 70 - 97, XP002207974 *
"IEEE standard Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications. (ISO/IEC 8802-11, ANSI/IEEE Std 802.11a-1999) Chapter 17: OFDM PHY Specification for the 5 GHz band", IEEE STD 802.11A-1999, 1999, pages 4 - 45, XP002269120 *
HARA S: "OVERVIEW OF MULTICARRIER CDMA", IEEE COMMUNICATIONS MAGAZINE, IEEE SERVICE CENTER,NEW YORK, NY, US, December 1997 (1997-12-01), pages 126 - 133, XP000858431, ISSN: 0163-6804 *
ORFANOS, G. ET AL.: "A modified IEEE 802.11 MAC Protocol for MC-CDMA", INTERNATIONAL WORKSHOP ON MODELING ANALYSIS AND SIMULATION OF WIRELESS AND MOBILE SYSTEMS, 7 October 2004 (2004-10-07), Venezia, Italy, pages 52 - 55, XP002435178, Retrieved from the Internet <URL:http://portal.acm.org/> [retrieved on 20070524] *
TSUMURA S ET AL: "Design and performance of quasi-synchronous multi-carrier CDMA system", VTC FALL 2001. IEEE 54TH. VEHICULAR TECHNOLOGY CONFERENCE. PROCEEDINGS. ATLANTIC CITY, NJ, OCT. 7 - 11, 2001, IEEE VEHICULAR TECHNOLGY CONFERENCE, NEW YORK, NY : IEEE, US, vol. VOL. 1 OF 4. CONF. 54, 7 October 2001 (2001-10-07), pages 843 - 847, XP010562548, ISBN: 0-7803-7005-8 *
YI S J ET AL: "Adaptive minimum bit error rate multiuser detection for asynchronous mc-cdma systems in frequency selective rayleigh fading channels", PERSONAL, INDOOR AND MOBILE RADIO COMMUNICATIONS, 2003. PIMRC 2003. 14TH IEEE PROCEEDINGS ON SEPT. 7-10, 2003, PISCATAWAY, NJ, USA,IEEE, vol. 2, 7 September 2003 (2003-09-07), pages 1269 - 1273, XP010679266, ISBN: 0-7803-7822-9 *

Also Published As

Publication number Publication date
WO2007066299A2 (en) 2007-06-14

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